What a good photo of the brooches Bryce. I too think that QEII is wearing the same brooch as in 1939.

Below is another unknown (to me) brooch which QEII wore for a christening in 1948. I have always been keen to find an image of the diamond floral spray given to her by the Household for her 21st birthday. This is on my list of possible contenders, although this may have been a wedding present etc.